Mounting light filter



.May'23, 1933. J. OBERMEYER ET AL MOUNT ING LIGHT F I LTER Filed Feb. 23,. 1932 lNVENORS BY z TTORNEY Patented May 23, 1933 UNITED STATES PATENT OFFICE irosnrI-r OBERMEYER, or. new YORK, AND AUGUST BOS'IROEM, or BROOKLYN, new YORK, lissronoas, Y ssnn ASSIGNMENTS, T0 snares MANUFACTURING 001m. IPANY, or DECATUR, ILLINOIS, A coaroarrrron or ILLINOIS MOUNTING LIGHT FILTER Application filed February 23, 1932. Serial No. 594,456.

Our invention relates to illuminating de- I vices and in, particular to Convenient means for supporting light filters in relation to the I source of light. 'While our invention, as illustrated in the drawing, is shown particularlyapplied to suchuse, it is obvious that 1t may be useful in other arts to connect separated members. p

The main objects of our invention are to provide a convenient means for mounting a light filter near a light source and to provide a mounting that is easily detachable so that ready access may be had to the adjacent parts for cleaning, replacement or other purposes. These same objects, and others too numerous to mention, are in view where our invention is used to join any separate elements in other arts,and its use for such purposes, will be obvious. The particular means by which we accomplish these objects will now befully described.

, Referring more particularly to the'draw- Fig. 1 is a perspective View of our invention applied .to a portablelamp of conventional style. The reflector is positioned so as to expose the invention.

Fig. 2 is a top plan viewof our invention, part of the lamp reflector being broken away.

Fig. 3 is a sectionalview on line 3-3 of Fig. 2,.looking in the direction of the arrows.

Fig. 4 is an end elevation of our invention, looking at it from the right of Fig. 2.

Fig. 5 is a section, looking in the direction of the arrows, on line 5-5 of Fig. 6, the reflector being shown in place.

Fig. 6 is a plan view of a portion of a modifled form of the invention, the reflector not being shown.

' .Fig. 7 isa section online 7-7 of Fig. 8, looking in the direction of the arrows, the re flector being shown in place.

Fig. 8 is a plan view of a portion of another modified form of the invention, the reflector not being shown.

Fig. 9 is a sectional view similar to Fig. 3, showinga modification. Similar numerals indicate similar parts throughout the views.

In Fig. 1, our invention, designatedcollectively by D, is shown attached to the reflector of a portable lamp having a reflector supporting bracket B, and a standard G. D carries light filter 21, of a color designed to screen outall unwanted radiations from the laterally. This point will be, further eX- plained in what follows. 1

Instead of the single step mentioned, a series of such steps could be used, resulting in corrugated surface. These steps need not necessarily be parallel but could be arrangedin variouspatterns. A bowed clamp member 24 is provide with a portion 25, shaped to conform to the convex surface of the step22of the reflector and with an opposed portion 26, through which pass the screws 27, in threaded engagement therewith. The screws 27 are directed to fit into the concave surface of the step 22 of reflector A. 3

The result of this construction is a clamp that cannot be removed by sliding same laterally out of place. It'is necessary first t6 loosen the screws 27.

It has been mentioned above that the SUP-4 faces of the reflector step 22' are subject to certain limitations. For instance, if the step consisted of a single plane angularly disposed to the main body of the reflector or if it were a portion of a cylinder and the thick-. ness of thereflector walls were uniform, it would be possible to slide the clamp laterally and remove it without touching the screws 27. So also, with certain forms of steps Where the thickness of the reflector walls decreases toward the edge.

To provide greater rigidity the clamp member 24 may also be provided with a lip or extension 28. Where a plurality of steps is used the lip 28 would be formed to conform thereto and additional holding power secured thereby.

Vhile we have illustrated the screw 27 inside the reflector, a construction in which the relative positions of screws 27 and clamp portion 25 is reversed, is also within our contemplation. In this case the screw heads would be outside of the reflector and the concave surface of steps 22 might be outside instead of inside the reflector.

It is also possible to have the screws '27 press against a convex surface of the reflector step, altho in this case it would be more diflicult to secure rigidity. In this case the opposing clamp surface might fit a convex "surface on the reflector.

So far it has been tacitly assumed that the reflector walls are substantially uniform in thickness, whichis usually the case with blown glassware, or metalware formed from sheets, but it would also be possible to have the reflector walls of variable thickness and to provide one or more ribs and hollows in the reflector. The screws 27 would then, as before, oppose a surface of the clamp member. Care must be taken that the surfaces are so designed as to make it impossible to slide the clamp laterally.

Two screws 27 are illustrated. Itwould be possible to use only one screw preferably located in the middle of the clamp, or a greater number of screws than two.

The light filter 21 is carried by a pair of channeled brackets 29, fastened to theclamp member 24, either permanently as by welding, soldering or riveting, or removably, as by screws. In the form illustrated the clamp screws 27 pass through the brackets where they are fastened to the clamp member, being also in threaded engagement therewith. This construction provides a longer threaded surface for 'the clamp screws'27 and makes for greater strength and rigidity.

A retaining means in the form of a leaf spring 30 is provided to hold the light filter 'fric'tionally within each bracket 29. This spring is formed with a loop 31 fitting over a tongue 32 formed by slotting the bracket and is put under such tension as to exert pressure against the light filter 21.

Instead of the spring 30 it would also be possible to use a screw or screws 38 (see Fig. 9) passing through one or both the brackets 29. When suitably adjusted these would exert pressure against the light filter 21 and so frictionally hold same against removal from the brackets.

The modification of Figs. 5 and 6 shows a positive retaining means in the form of a screw 33 interposed in each channeled bracket 29. A modified form of reflector and clamp are shown. The reflector A has a step 22' formed of angularly related flat surfaces and the clamps 24 arecorrespondingly formed. There are two clamp members 24:

provided. These are connected by a strip 3% fastened at each end to a clamp member 24, preferably in a permanent manner, such as by welding, riveting or otherwise.

Another modification is shown in Figs. 7 and 8. Here the channeled brackets 29" are extended to form a clamp member 24", which engages the reflector A. A clamp screw 27" is used as before. The two brackets'29 are connected to each other by strip 34".

A spring 35", riveted to channel 29 at 37, normally obstructs removal of the light filter 21 from the channels. On retraction into the position 36", however, the light filter is removable.

Instead of the screw 33 of Fig. 5, a springactuated pin might be used. This might be withdrawn manually when it was desired to slide the light filter either out or in, or its end might be shaped like a blunt wedge, so that when the light filter was slid and suflicient pressure exerted against one of the inclined wedge surfaces, the spring would yield and the pin move out of the way to allow the filter to be inserted or removed.

It will thus be seen that our invention is adapted to carry out all the objects mentioned in a convenient and economical manner.

TV hat we claim is:

1. A reflector having its surface near its edge broken up into one or more steps or ridges, a clamp member having a portion of its surface formed to conform to the steps or ridges on the reflector so as to be complementary or negative thereto, one or more screws mounted in the clamp member in opposed relation to the stepped portion of the clamp member and engaging the inner surface of the reflector so as to draw the complementary surfaces of the clamp member and the reflector together, a pair of grooved brackets carried by the clamp member, a light filter carried by said grooved brackets, and one or more screws carried by the brackets to retain the light filter therein, the relation between the form and arrangement of the steps or ridges of "thereflector surface and the co-operative clamp parts being such that when the parts are clamped together the clamp may not be slid laterally along the surface of the reflector.

2. A reflector having a portion of its surface near its edge broken up into one or more steps or ridges, a clamp member having a portion of its surface formed to conform to the steps or ridges on the reflector so as to be complementary or negative thereto,'means engaging'theinner surface of the reflector adjustably mounted on the clamp member so thibeing in angular relation to the main body of the element, and the second. portion angularly related to the first portion, one part of the clamp being formed substantially to the same contour as the step and the adjacent portions of the element, adjustable means carried by the clamp in opposed relation to the first-mentioned part of the clamp and directed toward a concave portion of the stepped portion of said element, and means carried by the clamp for holding the other element.

4. In combination, a. reflector having its lower edge formed into a step comprising a portion bent outwardly and an adjacent portion bent downwardly, a clamp comprising a channeled portion formed on one side to con 7 form to the outer surface of the step and the adjacent main portionof the reflector, one or more screws on the opposite side of the channeled portion adapted to engage the inside of the reflector at the junction of the outwardly bent and downwardly bent portions of the step, a pair of grooved brackets carried by the clamp, a light filter positioned Within the grooved brackets, and retaining means for holding the light filter in place in the grooved brackets.

5. A combination of elements as defined in claim 4, the retaining means consisting of an element whereby pressure may be applied against the light filter and thereby frictionally oppose its removal from the grooved brackets.

6. A combination of elements as defined in claim 4, the retaining means consisting of one or more screws mounted in the grooved brackets so that their ends press against the light filter and thereby frictionally oppose its removal from the grooved brackets;

7. A combination of elements as defined in claim 4:, the retaining means consisting of an element adjustably mounted to open or obstruct the groove of one of the grooved brackets so as to prevent removal of the light filter therefrom when said element is in its obstructing position.

8. A combination of elements as defined in claim l, the retaining means consisting of a movable element mounted so as to normally obstruct the groove of one of the grooved brackets in order to prevent removal of the light filter therefrom but permitting removal when moved from its normal position.

9. A combination of elements as defined in a claim a, the retaining means consisting of an elastic movable element mounted so as to normally obstruct the groove of one of the grooved brackets, thereby preventing rem-oval of the light filter therefrom, but permitting such removal when moved aside from its normal position.

Signed at New York, in the county of New York and State of New York this seventeenth day of February, A. D; 1932.

JOSEPH DEER-MEYER. AUGUST BOSTROEM. 

